Abstract
The major disadvantages of uninterruptible d.c. power supply systems in present use are either an unequal loading of individual sources or dependence on a separate control block or a dominant unit. A new redundant-type configuration featuring a feedback-controlled current sharing is proposed. Its inherent symmetry enhances the overall reliability/ and/ the number of parallelable sources being not limited/ truly large uninterruptible d.c. power supply systems become feasible. The influence of the minor feedback loops on the system dynamical behaviour is investigated and a necessary small-perturbation stability criterion is formulated. An approximate expression relating the gain in the minor current-controlling loop to the sharing error and parameter dispersion is given.
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